Looper mechanism for sewing-machines.



PATENTED OCT. 24, 1905. L. ONDERDONK.

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UNITED STATES PATENT A OFFICE.

LANSING ONDERDONK, or WINTI-IROP, MASSACHUSETTS, ASSIGNCR TO UNIoN SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINoIs,

A CORPORATION OF ILLINOIS.

LOOFER MECHANISM FOR SEWING-MACHINES.

Application filed December To all whom it may concern.-

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at Winthrop, in the county of Suffolk, State of Massachusetts, haveinvented certain new and useful Improvements in Sewing-Machines, of which the following is a description, reference being had to the accompanying drawings and to the letters of reference marked thereon.

My invention relates to animprovement in double-'chain-stitch sewing-machines; and its object is to provide a mechanism for operating the under-threadcarrying looper which shall be simple and compact in construction and which shall be capable of high speed and which can be operated with a minimum amount of friction and bind of the Working parts and without requiring such a nicety of adjustment as is usual in machines of the class to which the invention relates.

The present invention is designed as a special improvement in that type of machine illustrated in Patent No. 568,702, of September 29, 1896, which general type of machine includesarotating shaft, alooper-carrier having wings between which is embraced an inclined crank to give the carrier, and therefore the looper, an oscillating movement in the direction of its length, and having also means for giving to the looper-carrier a sidewise movement, the construction in said patent referred to for giving said sidewisemovement comprising an eccentric on the main shaft engaging rearwardly-extending wings on the looper-carrier, the looper-carrier being supported in a pivoted yoke. In the construction illustrated in said patent it will be noticed that in the movement of the loopercarrier caused by the oscillation of the pivoted yoke as it passes from one side to the other it rises above or dips belowa horizontal line, and consequently as the inclined crank rotates and gives the oscillating movement to the looper-carrier in the direction of the length of the looper there will be more or less bind of the pivot-yoke upon its bearingpoint. which bearing-point in, said patent is the forward end of the feed-shaft.

The invention consists, broadly, in means for supporting the pivoted yoke whereby in its sidewise oscillation and in the movement of the inclined crank which gives the oscillating movement to the carrier in the direc- V Specification of Letters Patent.

Patented Oct. 24, 1905. 5. 1896. semi No. 614,574..

tion of the length of the looper said pivoted yoke may automatically move up and down.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation of so much of a sewing-machine as is necessary to an understanding of my invention. Fig. 2 is an end view with the looper-carrier removed, the inner and exterior lines of the bed-plate being denoted by the circular lines. Figs. 3 and 4: are detail views of the block on which the yoke is fulcrumed. Fig. 5 is a detail view of the yoke. Fig. 6 is an end view of the loopercarrier. Fig. 7 is a front sectional view illustrating the invention, and Fig. 8 is a top view of the same.

In the drawings, A represents a portion of the bed-plate of asewing-machine, herein shown cylindrical in shape. B represents the actuating-shaft, which has its forward bearing in a standard A, located near. the foring. On this driving-shaft forward of the front bearing is arranged an inclined crank b, an eccentric 7), and a feed-lifting eccentric a, said crank and eccentrics being preferably formed on or integral with the stud or spindle b", which is secured in the hollow forward end of the driving-shaft B.

H represents the feed rock-shaft, journalcd in the arm or cylinderA, preferably beneath the shaft B, and may be operated by the means shown in the patent hereinbefore referred to and is engaged with the eccentric it) in the manner described in connection with said patent.

O represents the looper-carrier, which is provided with a socket in which is secured a thread-carrying looperf, this looper-carrier being pivoted on cone center-screws 0?, secured in the arms of a yoke l) by nuts d, this yoke being arranged transversely of the machine and pivoted on the extended forward end of the feed rock-shaft H, as hereinafter described. This looper-carrier O is provided with rearwardly-extending Wings, between which works the eccentric o, and is also formed with liangesf, between which the inclined. crank 6 works, the latter vibrating the loopcrcarrier on its pivot-screws (Z to impart longitudinal movements to the looper, and the eccentric b rocking the said looper-carrier and its supporting-yoke D laterally to give the ward part of the cylindrical bed-plate or cas-' necessary sidewise movements to the looper. Up to this point the mechanism is substantially the same as shown in the patent above referred to. In the construction shown in said patent, however, there is a liability of binding, heretofore pointed out, and to obviate this objection I have provided a special construction of pivoted yoke D, which I will now proceed to describe.

Upon the forward end of the feed-shaft is loosely supported a block it, which is held in place by the adjustable collar it on the feedshaft at the rear of said block and by the nut b and lock-nut if, arranged on the screwthreaded forward end of the feed-shaft, which nuts are in advance of the block.

While I have spoken of the block b, the collar, and the nuts supported on the forward end of the feed-shaft, it is understood that I prefer to provide a separate shaft or rod, which is secured into the forward end of said feed-shaft. This block it, which is pivoted on the forward end of the feed-shaft, is grooved to receive the sides (Z of the forkedlower end of the yoke D, these sides (Z embracing the block and being adapted to slide up and down in the grooves thereon as the loopercarrier oscillates from side to side and the yoke with the block 72 swings. By this arrangement all friction or binding on the pivotpoint of the yoke is prevented, for as the lateral movement of said yoke takes place it, with the block which is pivoted on the forward end of the feed-shaft, oscillates back and forth; but slight bodily movement up and down is permitted the yoke by reason of the sliding connection thereof with the block.

It will be understood that I do not wish to be limited to the exact sliding connections shown between the yoke D and the block 71, as other means may be devised for accomplishing the same result. Furthermore, by providing the adjustable collar it and the nuts if if the block and the yoke may be adjusted to or from the end of the feed-shaft, and thus admit of a corresponding adjustment of the looper, which may be necessary in replacing old parts by new ones or in case the inclined crank or the looper-carrier be adjusted to vary the throw of said looper.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is

l. A looper-operating mechanism for sewing-machines comprising a looper having a vibratory movement in the direction of its length, a frame or yoke upon which the looper is supported having a vibratory movement transverse to the longitudinal axis of the looper, means for vibrating the looper and the supporting yoke or frame, and means for permitting the supporting-yoke to have a vertical movement relative to the axis upon which it swings.

2. A looper-operatingmechanism for sewing-machines comprising a looper-carrier, a pivoted yoke or frame supporting the carrier, means for oscillating the looper-carrier and the yoke, and means for permitting the yoke to move up and down relative to its pivot-point as it oscillates; substantially as described.

3. A looper-operating mechanism for sewing-machines comprising a looper-carrier, a pivoted yoke or frame supporting the carrier, means for oscillating the looper-carrier and the yoke or frame, said yoke or frame having a sliding connection with its pivotal axis; substantially as described.

4. A looper-operating mechanism for sewing-machines comprising a looper-carrier, a yoke supporting the same, a pivoted block, said yoke having sliding connection with the pivoted block, and means for operating the looper-carrier and yoke; substantially as described.

5'. In a double-chain-stitch sewing-machine the combination with a needle and its operating mechanism, of a looper-operating shaft extending longitudinally of the machine, a

I yoke arranged transversely to said shaft, said yoke being pivotally supported to have a sliding movement on its pivot, a looper-carrier pivoted on its opposite sides to said yoke, a thread-carrying looper arranged to vibrate longitudinally in a plane transverse to said yoke, and devices operated by said shaft and in contact with said looper-carrier to vibrate the latter to move the said looper back and forth longitudinally, and through said loopercarrier to rock said yoke to move the looper laterally; substantially as described.

6. A looper-operating mechanism for sewing-machines comprising an actuating-shaft, a pivoted block provided with grooves, a yoke having a forked lower end the sides of which rest in said grooves, a looper-carrier pivotally supported on said yoke, and means for oscillating the carrier and the yoke; substantially as described.

7. In the herein-described looper-operating mechanism, the adjustable pivoted block, the yoke having a fork embracing said block but relatively movable vertically with respect thereto, a looper-carrier supported on said yoke and means for giving the carrier its desired movements to operate the looper; substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

LANSING ONDERDONK.

Witnesses:

GHAs. L. STURTEVANT, F. S. FAWCETT.

IIO 

